The correct statement regarding various types of molecular speeds are

Options

A. increasing temperature increases the fraction of molecules having `U_(mps)`
B. Increasing temperature increases `U_(mps)`
C. In a sample of gas at a given temperature, molecules with extremely low and high speeds are less
D. At the same temperature lighter gaseous having narrow distribution of molecular speeds than heavier gaseous

Answer

B, C

Explanation

`U_(mp)` increasing with T, but the fraction decreases. Heavier molecules have narrow distribution.